Ground-wire clamp.



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PATRNTRD AUG. 4, 1908. K. R. MILLER. f GROUND WIRE CLAMP.

APPLICATION FILED JULY 6, 1907.

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UNITED sTATs PATENT oEEroE KEMPSTER B. MILLER, OF CHICAGO, ILLINOIS, ASSIGNOR TO STEEL GAIN MANUFACTURING COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

GROUND-WIRE CLAMP.

Specification of Letters Patent.

Patented Aug. 4, 1908.

Application filed. July 6, 1907. Serial No. 382,457.

To all whom it may concern:

Be it known that I, KEMPSTER B. MILLER, a citizen of the United States of America, and a resident of Chicago, county of Cook, and State of Illinois, have invented a new and useful Improvement in Ground-Wire Clamps, of which the following is a specification.

My invention pertains to ground wire clam s, or in general to the making of elec tricaFconnections with conductors where soldering is impossible and the only practical form of electrical connection is some mechanical gripping device.

My object is to provide an improved device of such simple design as to be of low cost, at the same time easy and quick of application, and furnishing a secure, durable and reliable connection.

In the drawings Figure 1 shows my device before ap lication; Iig. 2 shows the device as applic to a metal pipe, the ipe being shown in section; Fig. 3 shows e evation of the device as applied in Fig. 2.

In the figures, 1n which like reference numbers refer to like parts throughout, 1 is a plate substantially square havin ears 1 1 at two adjacent corners. It is dril ed with four holes at 22-2-2 near the corners, and is drilled and threaded centrally. The U- sha ed wire 3 is passed through holes 2-2 an machine screw 4 is screwed into the threaded central hole. The machine screw 4 is rovided with washer 5 and nut 6. The dou led wire 3 thus forms a iiexible band for passing around the water pipe 7.

The device of Fig. 1 as thus described is ready for installation. The screw 4 is first withdrawn so that its end is approximately flush with plate 1. The free ends of the wire 3 are passed around the water pipe 7 or other object to which the ground w1re is to be attached, and are passed through the holes 2 2 respectively; they then are passed behind the adjacent projecting ears 1 1 the two ends then being twisted together as at 3 in Fig. 3. By thus passing the wire ends through an irregular path around the projections 1 1 before twisting them together, the resistance of the wires against a tendency to pull back through the holes 2 2 is increased, and the tendency to rupture the twist at 3 is overcome. The device is tight cned upon the pipe by turning the screw 4 which takes seat upon the pipe and tightens the wire 3 by increasing the distance between the screw plate l and pipe 7. Conductor 8 may be clam ed under nut 6 on either side of washer 5, t e locking of the nut 6 upon the conductor 8 serving also to lock the screw 4 in the plate 1.

Having thus described my invention, what I claim as new and desire to secure by United States Letters Patent is:

1. In a ground wire clamp, a screw plate, a screw therefor and a U-shaped wire engaging at its central portion one side of said plate and ada ted to engage the alternative side of said plJate by its end portions, substantially as described.

2. In a ground wire clamp, a screw plate having four holes therein, and a U-shaped wire passing through two of said holes, substantially as described.

3. In a ground wire clamp, a screw plate having holes therein, and a iexible pipeclamping wire passing through holes at one side of said screw plate and adapted to ass its ends through holes on the opposite si e of said screw plate, and projections on said screw plate adjacent to the holes for receiving the ends of said wire and adapted to assist in retaining the ends of said wire, substantially as described.

Signed by me at Chicago, county of Cook y and State of Illinois, in the presence of two witnesses.

KEMPSTER B. MILLER. Witnesses:

DAvID S. HULFrsH, Y IIARRIET L. SMITH. 

